For this case we have an equation of the form:
y = A * (b) ^ t
Where,
A: initial amount
b: decrease rate
t: time in years.
Substituting values we have:
7 = A * (0.5) ^ ((1/20) * t)
For t = 45 years we have:
7 = A * (0.5) ^ ((1/20) * 45)
Clearing A:
A = 7 / ((0.5) ^ ((1/20) * 45))
A = 33.3
Answer:
the density of the substance when it was deposited 45 years ago was:
A = 33.3 milligrams per square centimeter
Answer: yeah it makes sense is that 2 to the power of nothing
Step-by-step explanation:
Answer:
actual product 5358
this answer is correct because the estimate is reasonable
estimate 280 x 20 = 5600
multiply 2 x 28 then add 2 zeros
Step-by-step explanation:
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